Inductor current emulation circuit for multi-level switching conversion circuit and emulation control method thereof

Abstract

An inductor current emulation circuit is for emulating an inductor current of a multi-level switching conversion circuit which periodically switches a capacitor and an inductor among plural electrical connection states according to plural switching signals, thereby performing power conversion between a first voltage and a second voltage. The inductor current emulation circuit includes: a selection circuit for selecting plural candidate voltages according to plural state signals to generate a first emulation signal; and a filtering circuit for generating a second emulation signal according to a difference between the first emulation signal and a direct current voltage value, thereby emulating the inductor current. The plural state signals are associated with the plural switching signals, and each of the plural state signals corresponds to one of the plural electrical connection states. The plural candidate voltages are associated with the first and second voltages, a ground potential, and linear combinations thereof.

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